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10th International Conference on Laser and Fiber-Optical Networks Modeling (LFNM 2010). 2nd IEEE International Workshop on THz Radiation: Basic Research and Applications (TERA 2010)
Using numerical modeling, influence of tuning the lasing frequency within the gain band on the modulation response of quantum-well heterolasers in the GaInAs-GaInAsP system versus the modulation frequency of pump current is investigated. It is established that maximum values of the frequency width of the response band and possibilities of realization of high-speed regimes at signal transmission in...
In the given paper we proposed an effective finite-difference scheme for a two-dimensional problem of femtosecond pulse influence on a semiconductor in the case of nonlinear dependence of light energy absorption coefficient on electric field potential.
Modeling of the random lasing in diffusive regime by Monte-Carlo method and Kubelka-Munk theory has been carried out. It has been obtained the experiment-corresponded dependencies of radiation parameters on media characteristics. The optimal samples parameters for effective lasing have been found.
We analyze the VIPA demultiplexer for different reflection profiles, i.e., uniform, graded, and Gaussian. It is shown that VIPA demultiplexer characteristics can be improved dramatically by innovative reflection profile engineering. These improvements enhance the performance of demultiplexers in UWB-Over-Fiber systems.
The transformation of an incident plane harmonic wave caused by instant creation of a plasma sphere is investigated. Two stages of field evolution is shown. At the early stage a spatial and temporal field structure is similar partly to the case of an unbounded medium. Transients in the form of a nonstationary wave spectrum are observed at the second stage. The exact expressions for the transformed...
A method for calculating the refractive index of optical fused silica is proposed and realized. Fused silica is treated as a composite medium with nanopores in matrix with density differing from the crystalline quartz density. Maxwell Garnett model of effective dielectric permittivity is found to be accurate within 0.0002.
The nonresonant scattering of a photon by an electron (Compton scattering) in the field of a pulsed light wave is investigated theoretically. The approximation when a pulsewidth is considerably greater than the characteristic time of the wave oscillation is considered. The analytical expressions for the amplitude and cross-section of mentioned process are derived. It is concluded, that the total cross-section...
The process of resonant scattering of a lepton by a lepton in the field of pulsed light wave in general relativistic case is studied theoretically. It is demonstrated, that the obtained resonant differential cross-section of the scattering of an electron by an electron (an electron by a positron, an electron by a muon) in the pulsed light field may be several orders of magnitude greater than the corresponding...
Resonant two-photon annihilation of an electron-positron pair in the field of a moderately strong circularly polarized wave is investigated theoretically. The partial cross-section is derived. It is shown that the resonant differential cross-section can differ from that in the absence of the external field.
Resonant spontaneous bremsstrahlung by an electron scattered by a nucleus in the field of pulsed light wave is theoretically investigated. The bremsstrahlung cross section contains a resonant peak. It is demonstrated, that the resonant cross section of the spontaneous bremsstrahlung may be several orders of magnitude greater than the corresponding cross section in the external field absence. Obtained...
We propose ultra-compact all-optical XOR and AND logic gates based on multi-mode interference (MMI) without using nonlinear optics. Numerical simulations show that the least ON to OFF logic-level contrast ratio is 13.3 dB for XOR logic gate and 4.3 dB for AND logic gate in the whole C-band.
The resonant scattering of a photon by an electron through direct diagram was studied in the low intense pulsed plane wave. The resonant amplitude and the cross-section were obtained. It is shown that the resonant cross-section is several orders of magnitude greater than the nonresonant one.
The fabrication of two types of one-dimensional magnetophotonic crystals based on double-layer Bi-substituted iron garnet films with low and high Bi content as magnetic active layers is presented. Considerable Faraday effect enhancement in the fabricated multilayer structures is reported.
We have discovered that if input grating coupler is used to excite SEW the generated wave is differed essentially from SEW. This wave is conventionally named “pressed wave” by us. We examine the evolution of wave field with distance from input grating coupler and compare that with analogous dependence for SEW. It is shown that unlike SEW the intensity of pressed wave decreases not exponentially while...
In this paper, the performance of Optical Code Division Multiple Access (OCDMA) system is analyzed at different receivers by using Optical Orthogonal Codes (OOCs). Performance analysis is considered for the chip-level detector and optimum receiver. Our results demonstrate that optimum receiver require less BER i.e. 5.70e-008 than chip-level detector i.e. 2.54e-007 for fixed number of users i.e. for...
Passive polarization converter based on the Bragg reflector with multiple defects is proposed. The structure consists of N distributed Bragg reflectors (DBR) separated by N-1 defects. Transmittance spectra for two orthogonal polarizations of the incident plane wave are presented.
Approximate theory of interaction of optical waves with pure reflection gratings at fulfillment of the second and third orders Bragg conditions has been developed. Expressions of the reflectance were obtained. The start-oscillation conditions in gratings with amplification were searched. It is found that reflectance zeros are near generating modes of grating with amplification in gratings without...
Nanosize thin flat silver strip in the air is considered as an optical resonator. The scattering characteristics of the H-polarized electromagnetic wave diffraction are analyzed using the decoupled singular and hyper-singular integral equations (IEs) for the electric and magnetic surface currents on the strip. IEs are discretized with the aid of the interpolation type quadrature formulas. This algorithm,...
Spectral characteristics of the microcavity based on a free-standing mesoporous silicon layered structure containing nematic liquid crystal E7 are studied. Nonlinear thermal tuning of resonant peak position has been realized by both conventional and laser heating. In both cases reversible tuning is observed within 11 nm range. Laser beam with power of 100 mW provides total tuning of the microcavity.
Asymmetric multiple quantum well active regions for optically-pumped semiconductor disk lasers (OPS-DLs) are designed employing wave function engineering within GaAs/AlGaAs material system, which provide simultaneously good electronic confinement, large gain and effective carrier transport. Experimental investigation has shown that such an approach gives record values of the conversion efficiency...
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